Checking The Valves And Valve Guides - Yamaha YZF-R7 Owner's Service Manual

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VALVES AND VALVE SPRINGS
3. Remove:
• valve cotters 1
NOTE:
Remove the valve cotters by compress-
ing the valve spring with the valve spring
compressor 2 and attachment 3.
Valve spring compressor
90890-04019
Attachment
(for the intake valve)
90890-04114
(for the exhaust valve)
90890-04108
4. Remove:
• upper spring seat 1
• valve springs 2
• lower spring seat 3
• valve 4
• oil seal 5
NOTE:
Identify the position of each part very
carefully so that it can be reinstalled in
its original place.
EB403400
CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of
the valves and valve guides.
1. Measure:
• valve stem-to-valve guide clearance
Valve stem-to-valve guide clearance =
Valve guide inside diameter a –
Valve stem diameter b
Out of specification → Replace the
valve guide.
Valve stem-to-valve guide
clearance
Intake
0.005 ~ 0.029 mm
(0.0002 ~ 0.0011 in)
<Limit>: 0.06 mm (0.0024 in)
Exhaust
0.010 ~ 0.034 mm
(0.0004 ~ 0.0013 in)
<Limit>: 0.07 mm (0.0028 in)
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ENG